Driving mechanism used in connection with dental tools



Nov. 4, 1930. H. MEYER 1,780,495

DRIVING MECHANISM USED IN CONNECTION WITH DENTAL TOOLS Filed March 6,1928 .171 Venfar;

Hen/y fiver Patented Nov. 4; 1930 J i 2 aue,

HENRY MEYER, or Hang-1mg; enniyrAiwp f DRIVINGMEGI-IANISM' USED iucouuae rromwxmrr emme' 'm Application filed Marc 's, weas l-m n eeaseyehe s. teen-yaw 7. 3

This invention relates to driving n1ech;- anlilt nglove tlielinner saidshaft" anism. used in connection with dental tools. It frequentlyhappens when drilling a tooth the drill sticksand itis thrown out ofalignment which frequently causes slipping of the tool and suffering tothe patient. p ball hearing I The object of this invention is to providemeansused in connection with dental tools,

wvliereby, in. case a drill should stick the 1 1 means willautomatically disconnect the drill from the source of power withoutoperatingto. injure the mouth of a patient.

The inventlon also comprehends improve- 7 groove I best shown in Figure1 ofthe drawin we e it elial? E5 15 S 'bei ig nti 'rqsed' l 6 t I I on"c 'of a cliitch ma t r-e1 iT lit-511L111 si r1n dW th a t fern h l 9, rthe latter also heating in the "spiral oi e Maren- "The i q'l'l fserves- 3 te rin i r lefien r' as 9 a-sr i s fi outer 'end of saidspringbearing againstii 29 1 llfipfl Ql lm nted liability of the drillbecoming damaged or. I i V housed in the bore a? i the shaft is formedwith a spiral groove f,

.ZLZ'IHGII'BS in the details of construction and ar- I Q g, an rep- 1rangement of parts to be hereinafter de- TifThie iniier en d' 'f't fhij'b scribedand particularly pointed'out in the .w ith:aibeveledlfiangefiwith'which claims.

In the drawing: V p

' Figure 1- is a vertical section illustrating the device in uncoupledposition. i

Figure 2 is a similar view partly in elevation showing the deviceiii-coupled posi- I tion. g

Figs. 3,, 4, and 5 are detail views the clutch elements. I

' In the accompanying drawing, a indicates an elongated cylindricalcasing. Secured in the casing a is a bushing a having a bore 39 a?reduced at c Mounted to rotate in the reduced portion a of the bore isthe hub 0 of a tool holder 0 provided at its free end at c iWhQ "Fi ?e 1e l i h mein s e nee -5 "tales Place them the d ll .etitka'te. istanceonthe "tool aliemb s t e P W "'eesit ta e; heielutch j e tghkth f m f11110. th b l fle I) with means to cooperate with a tool. or l l t 1other implement. 6 1s a clutch member 'pi l g f 311 b f dbufi gn andformed. with a rejW'hilelthe, h me e separating, thebe el d fi ese'ifemes 'ei bii In theopposite end of the casing a is alofitspathand"bythe time the members be- P fixed-bushing h forming abearing for the egl thj tichispfifig bhihd, 49 reduced portion ]t1 of apower driven shaft. fiqpgeyanp ho-m idi ng g p connectedat it to theusual flexible shaft; l w z :J The inner end of the power driven shaftis enlarged as shown at if, the enlargedportionv abutting against thebushing h and 45 retained in position by a fixed collar bearing againstthe outer end of the bushing if; that is to say, the power drlven shafth is held against endwise movement relative to "thebus'hing k Theenlarged portion h rof duced end, engaging tion-of the hub 0 position asclearly shownin FigureQ. Zoe

Obviously, the construction described provides simple and usefulautomatic means for disconnecting the tool from the power driven shaftwhen a drill sticks, and means for holding the clutch members separated,

with means for readily engaging the clutch members when the difiicultywith the drill has been removed.

What I claim is:

10 1. In combination, a casing, a power 7 driven shaft mounted in thecasing, said shaft having a. spiral groove, .a clutch memo ber slidablymounted on the end of said shaft, a ball seated between the'clutchmember and the spiral groove, a second clutch member mounted in thecasing in alignment with the first mentioned clutchymember, a toolholder carried by the second mentioned 7 clutch member, a spring fornormally mov- "gg ing the first'mentioned clutch member to engage thesecond mentioned clutch member, and an automatically operated latch forholding the first mentioned clutch member out of engagement with thesecond mentioned 2s clutch member.

2. In combination, a casing, a bushing mounted in the casing, a powerdriven shaft having a reduced extension mounted in the bushing, saidshaft having a spiral groove,

ea cup shape flange mounted on the power driven shaft, a clutch memberhaving a sleeve mounted onthe end of' the power driven shaft, a ballseated between the sleeve and the spiral groove, a spring between thesleeve and the cup shape member, the sleeve having a beveled flange, aspring actuated latch on the casing to automatically ride over theclutch member when thelatter is moved against the tension of the spring,

whereby to hold said clutch member in inoperative position, a secondclutch member mounted in the casing in alignmentwith the first mentionedclutch member, and a tool holder carried by the end of the secondmentioned clutch 'member.

3. In combination, a casing, two clutch members mounted in longitudinalalign-V ment in the casing, one of said clutch members having alongitudinal movement in the casing, means associated with the movableclutch member and actuated when the other of said clutch members meets aresistance,

to-cause said movable clutch member to move 7 way from the other clutchmember, a resilient latch mounted on the casing to-automat-ically engagethe movable clutch member and hold it separated from the other saidclutch member. 7 r In testimony whereof I afliX my signature.

(so i HENRY MEYER.

